diff --git a/gtsam/hybrid/HybridNonlinearISAM.cpp b/gtsam/hybrid/HybridNonlinearISAM.cpp
index d05e081dd..57e0daf8d 100644
--- a/gtsam/hybrid/HybridNonlinearISAM.cpp
+++ b/gtsam/hybrid/HybridNonlinearISAM.cpp
@@ -99,7 +99,7 @@ void HybridNonlinearISAM::print(const string& s,
                                 const KeyFormatter& keyFormatter) const {
   cout << s << "ReorderInterval: " << reorderInterval_
        << " Current Count: " << reorderCounter_ << endl;
-  isam_.print("HybridGaussianISAM:\n");
+  isam_.print("HybridGaussianISAM:\n", keyFormatter);
   linPoint_.print("Linearization Point:\n", keyFormatter);
   factors_.print("Nonlinear Graph:\n", keyFormatter);
 }